Hm. Mine are right at 6 weeks old if the feed store guy "guessed" correctly and they were "a couple" of weeks old when I got them. They've been out to explore since just after I got them, and have had the run of the yard for about 2 weeks now as well. They leave the coop and run for the shed. Sometimes they will end up in the flower bed with the 5-6' tall lilies. Occasionally under the rose bush (although I think it's getting to be tight under there) and sometimes hidden in the thick variegated vine. I've never seen them out in the middle of the (thickly treed) yard, even once without my physically picking them up and moving them there, and even then, they don't stay long.